I have both the MDT LSS and the XLR element chassis. I haven't seen a noticeable difference in affecting the accuracy or precision potential of a rifle. To best determine which system to get, I would look instead towards the purpose of the rifle. If you want a lighter weight precision rifle that you can take hunting, I would grab the MDT LSS chassis then watch the weight of the stock you choose. If you want a dedicated precision rifle system for competition, I would take a hard look at the XLR system.

However, I am much more partial towards the traditional stocks. I have a McMillan stock on order for my PRS competition rifle. The XLR chassis will be repurposed into a backup rifle.